Milky Quartz with Chlorite/Mica inclusions

Physical Properties

Hardness: 7 (Mohs scale), Color: White/Opaque with dark grey/green bands, Luster: Vitreous to greasy, Crystal structure: Trigonal (Hexagonal), Cleavage: None/Conchoidal fracture.

Formation & Geological History

Formed in hydrothermal veins and pegmatites during the late stages of magmatic cooling or through metamorphic processes. Most vein quartz is found in tectonic or volcanic environments.

Uses & Applications

Milky quartz is used as an abrasive, in the production of glass and ceramics, and as a landscaping stone. Included specimens are popular in decorative lapidary and mineral collecting.

Geological Facts

The white 'milky' color is caused by millions of tiny microscopic inclusions of gas or liquid trapped during the crystal's growth. The dark streaks are likely chlorite or mica flakes trapped within the quartz matrix.

Field Identification & Locations

Identify by its hardness (will scratch glass), lack of cleavage, and white opaque appearance. Can be found worldwide in riverbeds, mountains, and mining tailings.

Identified on: 4/15/2026

Mode: Standard